Up choose how often you want to plug, the middle button is to tell how many minutes you want to work every time you plug in and the bottom is to turn it off or turn it on.
To install it you only have to place a bolt or take advantage of one that is around 2m. of the soil so that the ozone expands well in the area.
You will see that you end up with the bad smell and no odor will come out. You can place it in the door of where you have your marijuana dryer, so that it is not in contact with the plants, but neither does the smell leave your home.